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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de59e209467e3e9ef721d9f54c0224319b3914e2d42ab8b3147ad1bd84e029c' 
  AND token = 'rdROrJwW13CEiyTeiuRQlJfKYdWDpyeu/jsrPA2x9+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}